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-rw-r--r--I_anno/Programmazione_2/data_structures/matrix-graph.cc81
1 files changed, 81 insertions, 0 deletions
diff --git a/I_anno/Programmazione_2/data_structures/matrix-graph.cc b/I_anno/Programmazione_2/data_structures/matrix-graph.cc
new file mode 100644
index 0000000..a644ec1
--- /dev/null
+++ b/I_anno/Programmazione_2/data_structures/matrix-graph.cc
@@ -0,0 +1,81 @@
+#include<iostream>
+#include<list>
+
+using namespace std;
+
+template<class H>
+class matrix_graph {
+public:
+ ~matrix_graph() {
+ delete[] _m;
+ delete[] _k;
+ }
+ matrix_graph(int len) : _len{len}, _nodes{0}, _edges{0} {
+ _m = new int*[len];
+ _k = new H*[len];
+ for(int i = 0; i < len; ++i) {
+ _m[i] = new int[len];
+ _k[i] = nullptr;
+ for(int j = 0; j < len; ++j)
+ _m[i][j] = 0;
+ }
+ }
+
+ matrix_graph<H>* add_node(H k) {
+ if(_len == _nodes) return this; // no more space for new nodes
+ if(_index(k) > -1) return this; // nodes already exists
+
+ _k[_nodes++] = new H(k);
+
+ return this;
+ }
+
+ matrix_graph<H>* add_edge(H x, H y) {
+ int i = _index(x);
+ int j = _index(y);
+ if(i < 0 || j < 0) return this;
+ if(!_m[i][j]) {
+ _m[i][j] = 1;
+ _edges++;
+ }
+ return this;
+ }
+ void print() {
+ for(int i = 0; i < _len; ++i) {
+ cout << i << ' ' << *_k[i] << ": ";
+ for(int j = 0; j < _len; ++j) {
+ if(_m[i][j])
+ cout << *_k[j] << ' ';
+ }
+ cout << '\n';
+ }
+ cout << endl;
+ for(int i = 0; i < _len; ++i) {
+ for(int j = 0; j < _len; ++j) {
+ cout << _m[i][j] << ' ';
+ }
+ cout << '\n';
+ }
+ }
+private:
+ int _len, _nodes, _edges;
+ int** _m;
+ H** _k;
+ int _index(H x) {
+ for(int i = 0; i < _nodes; ++i)
+ if(*_k[i] == x) return i;
+ return -1;
+ }
+};
+
+int main() {
+ matrix_graph<string>* g = new matrix_graph<string>(5);
+ g->add_node("hello")->add_node("greg")->add_node("yes");
+ g->add_node("nop")->add_node("ok");
+ g->add_edge("hello", "ok");
+ g->add_edge("ok", "yes")->add_edge("yes", "ok")->add_edge("yes", "yes");
+ g->add_edge("yes", "nop");
+ g->print();
+ delete g;
+ return 0;
+}